GDaddy said:
My oldest son works as a cyber security analyst for a company that has several state and county governments among their clients. He tracks and monitors and deals with hackers in real time. I asked him about the issue and he said its ridiculously simple for a hacker to masquerade as almost any other party coming in from almost any other country because the hacks have been copied and are widely available in their networks. Although he's had no contact with any of the "election" hacking activity he thinks the origins of that traffic are domestic, not foreign. He expressed it as a strong opinion.
A valid, educated opinion, but still only an opinion.
The U.S. intelligence community have all found that, by looking at all the evidence gathered from all their various sources, the Russians have, and continue to, run counterintelligence operations against our democratic elections. These are intelligence "findings" not just opinions, and they take into account much more than just digital information.
What is most striking to me here is that, though there may be political opposition to the findings, there is zero dissension coming from the anywhere in the intelligence community. Compare this issue with that of Saddam's WMDs, which had all kinds of dissension n the ranks, and I think they must have a pretty compelling case.